Publication

Properties of Diffraction Gratings Used as Output Couplers in a Quasi-Optical Gyrotron

Minh Quang Tran, Jean-Philippe Hogge, Trach-Minh Tran
1993
Journal Articles

Abstract

The design of a diffration grating used as an output coupler for a Fabry-Perot resonator is presented. We then consider the problem of determining the distortion and the cross-polarization of the incident Gaussian beam. Different types of gratings and planes with straight or curvilinear grooves and elliptical, have been designed and built. The output pattern from a resonator using such a grating has been measured experimentally. We found that the elliptical grating generates the least distortion and cross-polarization. This result is attributed to the geometry of the grooves and is in excellent agreement with numerical calculations.

Official source

https://infoscience.epfl.ch/entities/publication/5f114491-02e3-4730-a9e6-73d40ebaa15f

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Minh Quang Tran, Jean-Philippe Hogge, Trach-Minh Tran
1993
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5f114491-02e3-4730-a9e6-73d40ebaa15f

About this result

Related concepts (32)

Diffraction grating

In optics, a diffraction grating is an optical grating with a periodic structure that diffracts light into several beams travelling in different directions (i.e., different diffraction angles). The emerging coloration is a form of structural coloration. The directions or diffraction angles of these beams depend on the wave (light) incident angle to the diffraction grating, the spacing or distance between adjacent diffracting elements (e.g., parallel slits for a transmission grating) on the grating, and the wavelength of the incident light.

Design

A design is a concept of either an object, a process, or a system that is specific and, in most cases, detailed. Design refers to something that is or has been intentionally created by a thinking agent, though it is sometimes used to refer to the nature of something. The verb to design expresses the process of developing a design. In some cases, the direct construction of an object without an explicit prior plan may also be considered to be a design (such as in some artwork and craftwork).

Diffraction

Diffraction is the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture. The diffracting object or aperture effectively becomes a secondary source of the propagating wave. Italian scientist Francesco Maria Grimaldi coined the word diffraction and was the first to record accurate observations of the phenomenon in 1660.

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